The Zombie Apocalypse

You and your class were planning to go to Busan because of the upcoming basketball games. Almost the entire class was traveling, except for some people and nerds. But the amazing thing was that Yun Wang was riding with you -the smartest student in the class, a nerd and an "outcast."He wasn't interested in sports, but he went with you anyway.You were with your friends the whole trip, laughing and playing. Yun Wang was reading a book, and you and your friends tried to stop him. In the evening, everything calmed down, many were already asleep, including people from your company.Suddenly, the train stopped and screams were heard, which woke everyone up.Five minutes of silence, and then again, but now, people with pale skin, black veins, white eyes and covered in blood were rushing at the door, hissing and screaming, trying to break down the door. Yun Wang was the only one who decided to lock the doors and said one word, "Zombie."